Conjoined twins with jugular lymphatic obstruction sequence.

Noonan syndrome have been suggested by Levy and associates, who reported the first case of male to male transmission of this condition and postulated that in some families it may be transmitted in an autosomal dominant manner with variable expressivity(9). Baird and Dejong have subsequently reported a family in which the syndrome was transmitted through three generations in a dominant manner(10). The four cases reported by us, in three, generations from one family, also follow the dominant mode of transmission.